Airport won't turn on in OS X v10.6

I created a new Location value, turned AirPort on successfully, deferred back to the Automatic location, edited the current Locations and purged the second one I created. So, all is back to normal. It is rather irritating but an temporary fix until Apple works it out.

Super,
this solved my problem!
Thanks!!

I have a very similar problem but with a twist. If my computer goes to sleep, or if I restart, I have the exact same problem described here. I can't connect to AirPort, and even get a message "No AirPort card installed". However, if I shut down, and then start, AirPort works just fine.

I tried changing the location as described here, and thought it worked (I put my iMac to sleep and woke it up with AirPort working). However, after sleeping overnight, this morning I had the same problem again. Obviously, I can work OK if I shut down my iMac every time I stop using it, but this is annoying at the minimum. Hopefully Apple fixes this problem soon.

when at location where I have my standard spot using a airport express do I have same message #no airport card installed". When at other locations with WiFi does work normal? Can choose network to connect in the menu bar.....

any solutions?

I have the exact same issue since installing Snow Leopard 10.6! The 10.6.1 update did nothing to solve this problem.

I have been searching for a solution for this problem over many threads and this solve my problem in a matter of seconds. Change your settings from automatic to a new one and presto! airport works like its should.
I was afraid that there was a problem with OS and I had to reinstall. Then I thought this isn't windows, it shouldn't be that difficult. Thanks for the help and a working solution!

I had same problem with Airport - no on/off ability after SL install.

As suggested, I duplicated my Location in System Pref/ Network/ Location
and everything now works fine.
Thanks.

Thank you so much, changing the location from "Automatic" to a new location worked for me too (so far anyway!).

I suggest installing the latest Snow Leopard update (10.6.1) before attempting to delete any files, zapping pRAM, etc. Doing so fixed my non-responsive AirPort.

Non of this fix my problem, second time I restart computer after new location set up same problem. Factory installed snow even bought a new airport express, now have 2 sites with problem, when I start with Airport express turned on does the menu bar airport symbol say "no airport card installed"
cannot do advanced setting of airport in system preference either.

I experienced the problem for the first time today:
First my airport Icon was blank, when I clicked it said "No Airport Card"
System profiler did not show an airport card. I tried a few of the fixes rebooted, booted from an external FW800 drive, Got "airport is off" but could not turn it on. Sys.Profiler DID now show a card.
ReBooted from internal (Both drives have 10.6.2) Sys Profiler now showed the Airport card while booted from the internal.
Tried the Network Pane, deleted "Automatic" all attempts to turn on the Airport card failed.
While surfing for solutions (on my iPhone) I looked up and my Airport icon was flashing, then solid, now it works.
I have no Idea what happened, and am hoping that this will not become a recurring issue.
What happened to 'They Just Work'?
I had Airport issues with 10.6 (but not Airport card issues) Now this, and My machine still forgets the network printer once a week.
Marvelous Machines, but this is not the Apple QC we've been used to.

Check your system.log (viewable using Applications->Utilities->Console) to see if there are any appropriate error messages.

By far most people using Snow Leopard have not experienced this problem, so it may well be a problem with your hardware rather than with Mac OS X itself.

I believe v10.6.2 is the problem.

I have the same problem. Reverting to 10.6.1 solved it.

Upgrading to v10.6.2 brings the problem right back.

Creating a new network location under 10.6.2 does not allow me to add an Airport entry.

A couple of days ago, Apple released a "fix-it" Airport update through Software Update. As near as I can tell it doesn't fix a thing.

More Snow Leopard "treats" ->
-> upgrading to Snow Leopard eliminated the ability of my machine to sync Address Book groups and iCal calendars with my iPod Touch (through iTunes) and my phone (through iSync)
-> 10.6.2 also rendered my very nice Brother MFC-7840W useless -- I can't scan or print with it.

WTH, Apple?

How exactly do you revert back to 10.6.1?